<template>
  <ul class="app-header-nav">
    <li class="home">
      <RouterLink to="/">首页</RouterLink>
    </li>
    <li v-for="item in list" :key="item.id" @mousemove="show(item)" @mouseleave="hide(item)">
      <!-- 一级分类 -->
      <RouterLink @click="hide(item)" :to="`/cate/${item.id}`">{{ item.name }}</RouterLink>
      <!-- 二级分类效果 -->
      <!-- <div :class="['layer', open ? 'openClass' : '']"> -->
      <!-- <div class="layer" :class="open ? 'openClass' : ''"> -->
      <div class="layer" :class="{ openClass: item.open }">
        <ul>
          <li v-for="sub in item.children" :key="sub.id">
            <RouterLink @click="hide(item)" :to="`/cate/sub/${sub.id}`">
              <img :src="sub.picture" alt="">
              <p>{{ sub.name }}</p>
            </RouterLink>
          </li>
        </ul>
      </div>
    </li>
  </ul>
</template>
<script>
import { computed } from 'vue'
import { useStore } from 'vuex'
export default {
  name: 'AppHeaderNav',
  setup() {
    const store = useStore()
    const list = computed(() => {
      return store.state.cate.cateList
    })
    // 同步修改vuex中的数据
    const show = item => {
      store.commit('cate/show', item)
    }
    const hide = item => {
      store.commit('cate/hide', item)
    }
    return { list, show, hide }
  }
}
</script>
<style lang="less" scoped>
.app-header-nav {
  width: 820px;
  display: flex;
  justify-content: space-around;
  padding-left: 40px;
  // 用户提高层级
  position: relative;
  z-index: 998;

  >li {
    margin-right: 40px;
    width: 38px;
    text-align: center;

    >a {
      font-size: 16px;
      line-height: 32px;
      height: 32px;
      display: inline-block;
    }

    &:hover {
      >a {
        color: @xtxColor;
        border-bottom: 1px solid @xtxColor;
      }

      // 控制二级分类的显示
      /*  >.layer {
        height: 132px;
        opacity: 1;
      } */
    }
  }
}

.layer {
  width: 1240px;
  background-color: #fff;
  position: absolute;
  left: -200px;
  top: 56px;
  height: 0;
  overflow: hidden;
  opacity: 0;
  box-shadow: 0 0 5px #ccc;
  transition: all .2s .1s;

  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 70px;
    align-items: center;
    height: 132px;

    li {
      width: 110px;
      text-align: center;

      img {
        width: 60px;
        height: 60px;
      }

      p {
        padding-top: 10px;
      }

      &:hover {
        p {
          color: @xtxColor;
        }
      }
    }
  }
}

// 控制二级分类进行显示和隐藏的类，类名为open
.layer {
  &.openClass {
    height: 132px;
    opacity: 1;
  }
}
</style>